Sepia currently looks great! though some parts other than the page background may still appear in their original color which makes it quite irregular?
To install Sepia (chromium based browsers only), download and extract the zip file Sepia.zip , enable developer mode in your browsers extension settings and select load unpacked then select the Sepia folder.
Tip: Use 'blacklist' feature to make Sepia ignore some websites.
Full Changelog: https://github.com/abraham-ny/Sepia/commits/1.1